NPanel: simplified screen/scaling management

Modules/SettingsPanel/SettingsPanel.qml

@@ -11,16 +11,11 @@ import qs.Widgets
 NPanel {
   id: root
 
-  panelWidth: {
-    var w = Math.round(Math.max(screen?.width * 0.4, 1000) * scaling)
-    w = Math.min(w, screen?.width - Style.marginL * 2)
-    return w
-  }
-  panelHeight: {
-    var h = Math.round(Math.max(screen?.height * 0.75, 800) * scaling)
-    h = Math.min(h, screen?.height - Style.barHeight * scaling - Style.marginL * 2)
-    return h
-  }
+  preferredWidth: 1000
+  preferredHeight: 1000
+  preferredWidthRatio: 0.4
+  preferredHeightRatio: 0.75
+
   panelAnchorHorizontalCenter: true
   panelAnchorVerticalCenter: true